No "Advanced Features" available to share VHDX files

Here's the basics of my setup:

• One physical server (WinServ 2012 R2)
• Four virtual machines (WinServ 2012 R2)
• One SMB Share (hosted by my physical server)
• Two of those virtual machines are part of a failover cluster (TESTFC-150)

When I am using the Hyper-V Manager on the physical machine to create a new VHDX file and add it to my Virtual Machine TESTVM-201, I am not prompted with the ability to "share" this VHDX file, as there is no "advanced features" extension available to this harddrive.

Did I screw up by creating these VMs in Hyper-V Manager instead of as roles in the Failover Cluster Manager? Does that make a difference?

Thanks in advance for any advice or information that might be provided. I am learning along the way.